Print More, Save More with RT TonerRT Compatible Lexmark 51B1000 Toner Cartridge• Quantity: 2 Black toner cartridge• Yield: 2.5k pages based on 5% coverage.• Compatible Printers: the RT compatible Lexmark 51B1000 toner is designed for Lexmark MS and MX Series MS317dn MS417dn MS517dn MS617dn MX317dn MX417de MX517de MX617de printers.The Renewable Toner Advantage• Higher print quality. The RT compatible Lexmark 51B1000 Black toner cartridge is ISO 9001 and 14001 certified and tested to ensure superior performance. • Peace of Mind. This item comes with a lifetime warranty against smudges, leaks, or defects. Fast replacements when requested.• Superior Support. We know printing is important - that’s why we have a U.S. based customer support team. We are customer obsessed! It makes our day to make you smile. Contact us with any technical or product issues and we will be happy to assist you. • Earth Friendly. We promote a cleaner, greener future. Printing Tips • A common error is the “non-genuine” message. If this occurs with the RT compatible Lexmark 51B1000 cartridge, press OK or Continue repeatedly to dismiss the message. The printer will resume your print job.• Despite the extreme care we take in packaging, sometimes items are damaged during shipping and this can affect print quality. In this case, we immediately send an RT compatible Lexmark 51B1000 toner cartridge. If you order more than one cartridge, please test them all.Happy Printing!